Rockwell Automation 1785 PLC-5 User Manual Page 41
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1785-UM022C-EN-P - February 2008
Planning to Use Your ControlNet PLC-5 Processor 2-3
The frequency of I/O chassis backplane updates depends on the
adapter, the type of scheduled data transfer (rack or module
connection) and the number of different modules being updated.
Actual I/O throughput times must be determined with real products to
determine if the I/O throughput times meet the requirements of the
application.
Input data from the private memory buffer is put
into the input image file. New input data
may stay in the private memory buffer up to 1
program scan or until the next housekeeping.
Scheduled data transfer
occurs between the PLC-5
and the adapter module in
the I/O chassis. Data may
stay in the private memory
buffer for up to 1 API.
In the same manner,
the I/O adapter has
scheduled I/O data
transfer with I/O
modules
Input data is written from the I/O module
to a private memory buffer on the adapter.
The new input data may stay in
the private memory buffer for as long
as it takes to complete the I/O chassis
backplane update.
In scheduled I/O data
transfer, updates occur
between logic scans
(i.e. during
"housekeeping")
Logic Scan
Housekeeping
Data
Table
Files
Private
Memory
Buffers
Private
Memory
Buffers
Scheduled Data
Transfer
Data Update
PLC-5 Programmable Controller
Adapter Module
I/O Modules
Program Scan
Data Update
I/O Chassis
1
2
3
What Happens During Scheduled Input Data Transfer
- Controllers 1
- Important User Information 2
- Summary of Changes 3
- Table of Contents 5
- Chapter 3 6
- Chapter 4 7
- Chapter 5 7
- Appendix A 7
- Appendix B 7
- Appendix C 7
- Appendix D 8
- Appendix E 8
- Terminology 10
- Installing Your ControlNet 13
- PLC-5 Processor 13
- Identifying ControlNet PLC-5 15
- Processor Components 15
- Before You Install the 17
- Programmable Controller 17
- Estimated Battery Lifetimes 20
- Dispose of a Battery 20
- Setting the I/O Chassis 21
- Backplane Switches 21
- Configuration Plug 22
- Installing Keying Bands 22
- Selecting the DH+ Station 23
- Address of Channel 1A 23
- Specifying the Serial 24
- Interface of Channel 0 24
- Selecting the ControlNet 24
- Network Address of 24
- Channel 2 24
- Installing a Remote 25
- I/O Link 25
- Connecting to a 29
- ControlNet Network 29
- Connecting a 31
- Programming Terminal 31
- Serial Channel 32
- ControlNet Connection 33
- Serial Cables 34
- DH+ Programming Cables 35
- Remote I/O Cables 35
- ControlNet Cables 35
- Processor 39
- I/O Chassis 41
- . . .. . 43
- Using I/O Forcing Operations 45
- Housekeeping 46
- Logic Scan 46
- First Word 48
- PCSC Overflow Bit 48
- PCSC New Data Bit 48
- PCSC Enable Bit 48
- Understanding Scheduled 49
- Connection Types 49
- Understanding ControlNet 54
- I/O Mapping 54
- RPI Default = 4 x NUT 59
- I:010 6 O:010 2 63
- Using the ControlNet 69
- PLC-5 Processor in a 69
- ControlNet I/O System 69
- Tap (4 choices) 70
- 1786-TPR 70
- I/O System 72
- 1.5 system 73
- Understanding the ControlNet 75
- System Software 75
- I/O Configuration Utility 76
- Information 77
- ControlNet System 81
- Programming Your 81
- 1756-CNB 82
- ControlBus 82
- Using the ControlNet I/O 83
- Transfer Instruction 83
- Sending Continuous Messages 85
- Using ControlNet 86
- Immediate Data Input and 86
- Output Instructions 86
- IMMEDIATE DATA INPUT 87
- N11:232 232 87
- IMMEDIATE DATA OUTPUT 88
- N12:175 175 88
- Using Selectable Timed 89
- Interrupts with a Program 89
- Your ControlNet System 91
- Status Indicators 93
- Using the DH+/RIO 95
- Monitoring ControlNet 96
- Configuration and Status 96
- Processor Specifications 97
- AVERTISSMENT 100
- Processor Status File 101
- S:13-S:24 111
- S:26-S:35 112
- S:36-S:78 113
- S:79-S127 115
- B-16 Processor Status File 116
- ControlNet Instruction Set 117
- Immediate I/O Execution Times 118
- ControlNet I/O Map-Entry 119
- Status Words and 119
- Error Codes 119
- ControlNet I/O status file: 120
- ControlNet I/O status file 121
- Fault Codes 131
- Appendix F 133
- Numerics 137
- 2 Index 138
- Index 3 139
- 4 Index 140
- Index 5 141
- 6 Index 142
- Index 7 143
- 8 Index 144
- How Are We Doing? 145
- BUSINESS REPLY MAIL 146
- Rockwell Automation 148
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